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Act12_sol - Period 12 Activity Sheet Solutions Electric...

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45 Period 12 Activity Sheet Solutions: Electric Circuits Activity 12.1: How are Voltage, Current, and Resistance Related? a) Data Collection Connect the DC power supply to the thin 30 cm length of nichrome wire. Adjust the power supply setting to 0, 1, 2, 3, 4, and 5 volts. For each voltage setting, record in the table the voltage shown on the analog voltmeter . Measure and record the amount of current at each voltage setting with a digital multimeter . Voltage (in volts) Current (in amps) Resistance (in ohms) (calculate using V = IR) b) Data Analysis Graph your data with voltage on the vertical axis and current on the horizontal axis. Choose values for the grid lines so that your graph fills most of the grid. Label your graph axes.
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46 c) Data Interpretation 1) Pick two points on the line you drew on your graph and find the slope using voltage A - yoltage B represents the difference in voltage between two points, and current A - current B represents the difference in current between the points. Dividing these quantities gives the amount of voltage per unit of current. 2) Compare your answer for the slope of the graph in part 1) above to your calculated resistance of the nichrome wire in the third column of the data table on the previous page. To find the resistances, solve V = I R for R: R = V/ I You should find that the calculated resistance is approximately equal to the slope of the graph. 3) Explain the physical meaning of the slope of your graph. The slope of V versus I = V/I = R. The slope is the resistance of the wire. 4) How does your answer compare to the resistance you measured for the thin 30 cm nichrome wire in Activity 11.5.b? In Activity 11.5.b you measured the resistance of the thin 30 cm wire using a multimeter. Here you calculate its resistance by measuring the voltage across the wire and the current flowing through it. Activity 12.2: What Is the Result of Adding Resistors in Series? a) We will use single bulb trays to determine the effect of adding resistors in series. 1) Connect a single bulb tray to a 3-battery tray. Note the brightness of the bulb. 2) Now connect a second single bulb tray in series with the first bulb. What happens to the brightness of the bulb? _ Both bulbs are equally bright, but they are dimmer than when only one bulb was connected to the batteries ._ 3)
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